Hey ty, I'm not sure about owning the rights to them but it's all CC0 so you can definitely use them in a game
thanks. So CC0 means public domain. CC0 (aka CC Zero) is a public dedication tool, which allows creators to give up their copyright and put their works into the worldwide public domain. CC0 allows reusers to distribute, remix, adapt, and build upon the material in any medium or format, with no conditions.